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/*
* Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of VegaOS nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/ioapic.h>
#include <machine/ioapicvar.h>
#include <sys/panic.h>
#include <sys/mmio.h>
#include <sys/cdefs.h>
#include <sys/syslog.h>
__MODULE_NAME("ioapic");
__KERNEL_META("$Vega$: ioapic.c, Ian Marco Moffett, "
"I/O APIC driver");
#define IOAPIC_BASE_OFF(off) ((void *)((uintptr_t)ioapic_base + off))
static void *ioapic_base = NULL;
/*
* Reads a 32 bit value from the IOAPIC
* register space.
*
* @reg: Register to read from.
*/
static uint32_t
ioapic_readl(uint16_t reg)
{
mmio_write32(IOAPIC_BASE_OFF(IOREGSEL), reg);
return mmio_read32(IOAPIC_BASE_OFF(IOWIN));
}
/*
* Writes a 32 bit value to the IOAPIC
* register space.
*
* @reg: Register to write to.
* @val: Value to write.
*/
static void
ioapic_writel(uint16_t reg, uint32_t val)
{
mmio_write32(IOAPIC_BASE_OFF(IOREGSEL), reg);
mmio_write32(IOAPIC_BASE_OFF(IOWIN), val);
}
/*
* Reads an I/O APIC redirection entry.
*
* @entry: Entry variable to read into.
* @index: Index to read.
*/
static void
ioapic_read_redentry(union ioapic_redentry *entry, uint8_t index)
{
uint32_t lo, hi;
lo = ioapic_readl(IOREDTBL + index * 2);
hi = ioapic_readl(IOREDTBL + index * 2 + 1);
entry->value = ((uint64_t)hi << 32) | lo;
}
/*
* Writes an I/O APIC redirection entry.
*
* @entry: Entry variable to write.
* @index: Index to write to.
*/
static void
ioapic_write_redentry(const union ioapic_redentry *entry, uint8_t index)
{
ioapic_writel(IOREDTBL + index * 2, (uint32_t)entry->value);
ioapic_writel(IOREDTBL + index * 2 + 1, (uint32_t)(entry->value >> 32));
}
void
ioapic_set_base(void *mmio_base)
{
if (ioapic_base == NULL)
ioapic_base = mmio_base;
}
void
ioapic_init(void)
{
size_t tmp;
uint8_t redir_entry_cnt;
union ioapic_redentry redir_entry;
/* Sanity check */
if (ioapic_base == NULL)
panic("ioapic base not set!\n");
tmp = ioapic_readl(IOAPICVER);
redir_entry_cnt = __SHIFTOUT(tmp, 0xFF << 16) + 1;
KINFO("Masking %d GSIs...\n", redir_entry_cnt);
for (uint8_t i = 0; i < redir_entry_cnt; ++i) {
ioapic_read_redentry(&redir_entry, i);
redir_entry.interrupt_mask = 1;
ioapic_write_redentry(&redir_entry, i);
}
}
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